Office 365 suite installs are updated regularly these days and sometimes things go wrong. Sometimes when it goes wrong, it is stuck with a cryptic bad image error involving the ApiClient.dll file. You can’t launch any Office apps. You can’t repair the install. You can’t even uninstall it without getting this error and it crashing. Sit back, relax. Here is how you fix it.

Exchange 2013 is a whole new beast when it comes to a stand alone Exchange server. A failed Exchange 2013 CU (Cumulative Update) can leave your Exchange server unresponsive to outside requests even though all Services are up and Powershell diagnostics are reporting everything working correctly. It leaves many Exchange Admins new to 2013 scratching their heads and attempting to restore from backup only to learn that a restore from backup does not work! What is this sorcery?! Stay calm. This is an easy fix and a lesson for new 2013/2016 Exchange admins that are used to the previous versions.